Pressure-regulator



' (N0 Model.) I

N. CURTIS.

' PRESSURE REGULATOR. No. 500,994. Patented Tu-1574,1893,

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m tqes'ses I I lfiyeqifnr NlTED STATES PATENT ()FFICE.

NELSON CURTIS, OF BOSTON, MASSACHUSETTS.

PRESSURE-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 500,994, dated July 4,1893.

Application filed August 18, 1888.

To all whom it may concern:

Be it known that I, NELSON CURTIS, of Boston, Massachusetts, haveinvented an Improvement in Pressure-Regulators, of which the followingis a specification.

The invention relates to that class of pressure regulators in which thepressure of the fluid operating a mechanism of the system to which theregulator is applied, is controlled by the pressure of a separate orindependent fluid; and as in regulators of this class heretofore in usethe instrument embraces two valves, onea balanced piston valve in themain passageway of the operating fluid, and the other, an auxiliaryvalve in a relief passageway from the high pressure side of the saidmain passageway, which said auxiliary valve is operated in one directionby a spring and in the other by the pressure of the said separate andindependent fluid.

The invention consists in a detail of construction, the principalfeature of which, as hereinafter set forth is a hook by the use of whichthe usual directions of the two said counteracting forces controllingthe said auxiliary valve, that is, the force of the said spring and theforce of said independent fluid, are reversed; whereby in a compactinstrument affording great facility for assembling and adjusting theparts, the said operating and the said independent fluids are kept wellapart.

As in former pressure regulators used by me, and as in steam traps, andother fluid systems heretofore in use, I employ in carrying out thepresent invention, a piston valve located in the main passage way of theworking fluid, and an auxiliary or controlling valve in a small passageway which connects the two parts of the said main passage way that lieon either side of the port of the said piston valve.

In the drawings, Figure 1 is a vertical ele-; vation of the saidimproved pump regulator. Fig. 2 is a vertical sectional elevation of thesame.

A is a shell or casting provided with hollow horizontal arm's B B and anupright chamber 0 between said arms, the said two arms andchamberforming a main passage-way for steam or other fluid.

D is the piston valve in said main passage- Serial No. 283,059. (Nomodel.)

way having a seat a supported by interior flanges or walls of the shell.The upper part of the piston valve is cup-shaped as shown, and fitsloosely in a cylinder b screwed into the walls of the chamber 0 from thetop.

E is a hollow piece screwed into-the top of the cylinder 1) andcontaining the portc of the auxiliary valve F whose stem works tightlythrough a guide piece cl screwed into the piece E, as shown. I

G is a conical shaped hollow casting bolted as shown to the top oftheshell A. It is slotted, as shown, to form a free air space for thepurpose hereinafter set forth and to receive the pointof the hook Hwhich takes into the stem of the auxiliary valve F, as shown; and itsupports on its top a diaphragm 9 that also rests on the flanged top ofthe stem of the auxiliary valve F. This diaphragm is held in place by acap or casting e screwed upon the top ofthe casting G to formatightchamber J above the diaphragm.

The cap e carries an upright projection serving as a support and guidefor the hook or arm H and its operating mechanism. This projectionpasses, as shown, loosely through a coiled spring S in a hole in theupper end of the hook or arm H, and also loosely through a handle pieceK that screws into said hole in said arm H to compress the said spring Smore or less, the offlce of the spring S being to lift the auxiliaryvalve F against any pressure there may be above the diaphragm g.

L is a union pipe screwed into cap 6 to serve as the continuation of aninlet passageway to chamber J above the diaphragm from the fluid raisedby the pump.

The shell A has within one of its walls a passage N opening intoarm Band communicating with the interior of hollow piece E, whichcommunicates by port 0 with the cup of the piston valve D, which by theloose fit of the piston has communication with arm B,

thus forming the small passage-way for the main fluid hereinbeforementioned.

A spring, S, helps the piston valve D to its seat when the port a isclosed as aforesaid.

In this pressure regulator there is no communication between the fluidsof the two systems. Moreover air circulating freely within the hollowcasing G separates the operating fluid in the lower part of theregulator from the fluid in the chamber J (this being a portion of thefluid raised by the pump) so that the temperature of the fluid in saidchamber J is not'injuriously afiected by that of the operating fluid. Ifthe temperature of the fluid in chamber J were abnormally raised itsexpansive force or pressure would tend to interfere with the propermovement of the diaphragm. In operation when the pressure of theindependent fluid above the said diaphragm g, is less than that ofspring S, the auxiliary valve will be lifted from its seat. The smallerpassage Way for the main fluid is then opened relieving the pressureabove the piston of the main valve in the main'fluid passageway andallowing that valve to open ble side or diaphragm g in contact with thefree end of stem of auxiliary valve, hook H and admit a fresh supply ofworking fluid.

I claim- 1. The combination with a main passage-1 way for fluid underpressure, a piston valve 1 therein, a relief passageway leading out ofsaid main passageway on the high pressure side of said piston valve, andan auxiliary valve in said relief passageway, all within.

shell A, substantially as described, of fluid chamber J, supported bysaid shell A, and provided with said flexible side or diaphragm g, incontact with the free end of the stem of said auxiliary valve, spring S,and hook H, taking into said stem, substantially as described.

2. The combination with a main passageway for fluid under pressure, apiston-valve therein, a smaller passage-way connecting two parts of thesaid main passage-way, one above and the other below the port of saidpistonvalve and an auxiliary valve in said smaller passageway, allwithiushell A, substantially as described, of fluid chamber J, supportedby said shell A and provided'with said flexitaking into said stem andspring S, substantially as described.

NELSON CURTIS. Witnesses:

W. W. SWAN, WM. S. ROGERS.

